Hi, I was wondering if you can confirm that the vol+ vol- AND mute buttons all work without issue with the LG OLEDCX55, the magic remote  and the Sonos Arc. As I am having issues with the mute button on my Playbase, which apparently cannot be resolved  It seems to be  a firmware issue with the IR controls of the CXTV and/or Magic remote and am not confident about an LG fix ).

(FYI the vol+ and vol- are working, but I cannot get the mute button to work, whatever I try)

Therefore, I  am contemplating  a very expensive, upgrade to make it work, but want to be 100% sure, that the Sonos Arc is fully compatible, with no known issues.

Thanks in advance for your help.

Hi @contractcooker, thank you for reaching out to the Sonos community and for letting us know about your concern. We appreciate you for sharing your feedback with us. Disabling the eARC is a workaround to address the audio dropping issues. We have no information to share with you yet when this will be resolved. I would also recommend reaching out to LG for further assistance. Let us know if you need help with any other information, we're here to assist you.

Rowena, thank you for the reply.

I followed the steps you outlined and ran a diagnostic report (confirmation number: 1360637274). It appears that this solves the audio dropping out on the Sonos Arc (haven’t had time to test the beam yet) HOWEVER it is my understanding that in order to enjoy the Dolby Atmos features of the Sonos Arc I need to have eARC enabled on the TV. I really want to be able to utilize my sound bar to it’s maximum potential. The Sonos Arc is not inexpensive and Dolby Atmos support was part of the reason why I decided to purchase it. Disabling eARC is not a very satisfying solution for a product that is supposed to utilize eARC. Again, please let me know if my understanding is incorrect but I believe eARC needs to be enabled for Atmos to function.

EDIT: also just wanted to comment that I have used multiple HDMI cables to rule out the HDMI cable being the problem.